Light bumper pad for anti-collision cap

Abstract

The invention discloses a light bumper pad for an anti-collision cap, and belongs to the technical field of personal protection equipment. The cushion pad body is integrally formed by silica gel and is of an arc-shaped strip-shaped streamline structure matched with the head, round protruding silica gel points which are staggered in height are arranged on the side, making contact with the head, of the cushion pad body, the interiors of protrusions are of hollow structures, the size of a cavity in a key area is larger, through holes and gaps at intervals of the protrusions form a three-dimensional ventilation channel, and the edge is designed to be gradually changed in thickness. According to the preparation process, precise forming is achieved through modular adjustable mold, silica gel pre-dispersion modification, gradient temperature-pressure vulcanization, gradient cooling, vacuum demolding and laser trimming inspection. Cooperative optimization of differential buffering, efficient ventilation and light weight is achieved, the impact absorption capacity of a key area is improved, the overall weight is reduced, the ventilation rate is improved, wearing is comfortable, installation and maintenance are convenient and fast, and the head protection device is suitable for head protection of high-risk scenes such as the industry and buildings.

Description

Technical Field

[0001] This invention relates to the field of personal protective equipment technology, and in particular to a lightweight impact-resistant hat cushioning pad. Background Technology

[0002] Safety helmets are widely used head protection equipment in industries such as industry, construction, and mining. They absorb and disperse external impact energy through a cushioning structure inside the helmet shell, thereby reducing or preventing direct injury to the wearer's head. Common cushioning structures include a headband fixed to the inner wall of the helmet and a cushioning pad located in the crown area. The two work together to enhance the shock absorption effect when worn.

[0003] In existing technologies, there are various methods for fixing the safety helmet cushioning pad. For example, Chinese utility model patent CN208048121U discloses a safety helmet cushioning pad that fixes multiple shock-absorbing springs inside the shell and connects silicone cushioning pads to the ends of the springs. While this structure can achieve the cushioning function, it has significant drawbacks in actual assembly and maintenance: before installing the cushioning pad, multiple shock-absorbing springs must be fixed to the helmet shell one by one, which is a cumbersome process; more inconveniently, when cleaning, replacing, or repairing the cushioning pad, the shock-absorbing springs must first be removed from the helmet shell before the cushioning pad can be taken off. This fixing method makes the installation, replacement, and daily maintenance of the cushioning pad extremely inconvenient, not only increasing operation time but also potentially affecting the reliability of the connection between the springs and the helmet shell due to frequent disassembly and assembly.

[0004] In addition, traditional cushioning pads mostly use single-density materials or uniform raised structures, which cannot be designed differently for the protection needs of different areas of the head (such as key impact protection areas such as the forehead and back of the head and non-critical areas on both sides). The impact energy absorption efficiency is low, and insufficient protection in key areas or redundant design in non-critical areas leads to increased weight.

[0005] To address the aforementioned issues, there is an urgent need to design a shock-absorbing pad for a helmet that offers precise cushioning, good ventilation, comfortable wear, and is lightweight, in order to overcome the shortcomings of existing technologies. Summary of the Invention

[0006] To address the problems mentioned in the background section, the present invention provides a lightweight impact-resistant cap cushioning pad.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a lightweight impact-resistant helmet cushioning pad, comprising a cushioning pad body, wherein the cushioning pad body is integrally molded from silicone material, the cushioning pad body is in the shape of an arc strip adapted to the human head, and its overall configuration is a streamlined shape that is wide at both ends and narrow in the middle, the surface of the cushioning pad body in contact with the head is provided with a plurality of circular raised silicone dots, the height of the plurality of circular raised silicone dots is staggered and the spacing is evenly distributed, and through holes are provided at the intervals of the plurality of circular raised silicone dots, and the gaps formed between the circular raised silicone dots constitute ventilation channels.

[0008] Preferably, the height of the plurality of circular raised silicone dots ranges from 2mm to 12mm, the diameter ranges from 3mm to 8mm, and the center distance between adjacent circular raised silicone dots is 1.5 times to 3 times their diameter; the outer edge of the buffer pad body and the non-contact head side adopt a thickness gradient design, with the edge thickness gradually changing from 5-12mm from the center of the body to 2-3mm from the outside.

[0009] Preferably, the cross-sectional shape of the circular raised silicone dot is one of a cylinder, a frustum, or a hemisphere, and the top of the circular raised silicone dot is provided with a rounded chamfer with a radius of 0.5-1mm.

[0010] Preferably, the interior of the plurality of circular raised silicone dots is configured as a hollow structure, wherein the average volume of the hollow cavity inside the circular raised silicone dots located in the forehead and back of the head is greater than the average volume of the hollow cavity inside the raised dots located in the middle region.

[0011] Preferably, the height difference of the plurality of circular raised silicone dots is controlled within the range of 1-3mm, and the height difference of adjacent raised silicone dots in the same area does not exceed 2mm.

[0012] Preferably, the hollow cavity is a shell with an opening at the lower end, wherein the lower end opening is open at the root position where the hollow cavity is connected to the buffer pad body.

[0013] On the other hand, the present invention also provides a process for a lightweight impact cap cushioning pad, comprising the following steps: Step 1: Design and process the mold based on the streamlined structure of the buffer pad body and the distribution of the circular raised silicone dots on the inner surface; the mold adopts a modular insert and adjustable ejector pin combination structure. The raised forming area of ​​the mold cavity is composed of independent modular inserts. The bottom of the insert is connected to an adjustable ejector pin with a connection accuracy of ±0.1mm. The raised forming surface of the modular insert is coated with a 5-8μm thick polytetrafluoroethylene nano-coating. At the same time, V-shaped guide grooves and micro exhaust holes are added at the raised gaps of the mold cavity. The V-shaped guide grooves are 1-1.5mm deep and 2-3mm wide, distributed along the arc contour of the buffer pad. The micro exhaust holes are 0.5mm in diameter and located at the end of the V-shaped guide grooves. Step 2: First, pre-dispersion modification of the liquid silicone is performed by adding nano-sized silane coupling agent at 0.5%-1% of the liquid silicone mass and fumed silica at 1%-2%. Two-stage dispersion is carried out using a twin-screw mixer and an 8-10 stage static mixer to control the viscosity of the modified liquid silicone at 3000-3500 cP. Then, the modified liquid silicone is injected into the cavity of the mold, and vulcanization is performed using a gradient temperature-pressure synergistic method. Specifically: Preheating time: 0-2 min; temperature: 120-130℃; pressure: 5-8 MPa. Vulcanization time 2-8min: mold cavity temperature 160-180℃ and pressure 15-20MPa for the wide area at both ends of the buffer pad, and mold cavity temperature 140-150℃ and pressure 8-12MPa for the narrow area in the middle of the buffer pad; Pressure holding time: 8-15 min; temperature: 130-140℃; pressure: 10-12 MPa. Step 3: A combined process of gradient cooling and vacuum demolding is adopted. During the gradient cooling process, the temperature change rate is controlled at 20-30℃ / min. First, the temperature is maintained at 100-120℃ by the heating jacket of the mold cover for 1-2 minutes, then cooled by circulating water at 50-60℃ for 2-3 minutes, and finally, room temperature air at 25-30℃ is introduced for 1-2 minutes. Before demolding, the vacuum degree is evacuated to -0.08 to -0.09MPa through the micro vent holes of the mold cavity, and demolding is completed by slight pushing with the ejector pin. Step 4, Trimming Inspection: Laser trimming is performed using a laser cutting machine. The cutting path is automatically generated based on the 3D model of the cushioning pad. After trimming, the edges are inspected using a combination of a 3D vision camera and a pressure sensor.

[0014] Preferably, before the injection of adhesive in step two, the modified liquid silicone needs to be vacuum degassed: the silicone is placed in a degassing tank with a vacuum degree of -0.095 to -0.1MPa and left to stand for 15-20 minutes to remove the tiny air bubbles generated during the mixing process inside the silicone.

[0015] Preferably, the mold cavity portion corresponding to the wide areas at both ends of the buffer pad body is vulcanized using a first temperature-pressure combination; the mold cavity portion corresponding to the narrow area in the middle of the buffer pad body is vulcanized using a second temperature-pressure combination; the temperature and pressure values ​​of the first temperature-pressure combination are higher than those of the second temperature-pressure combination, wherein the first temperature-pressure combination is a temperature of 165-180℃ and a pressure of 15-20MPa; and the second temperature-pressure combination is a temperature of 145-160℃ and a pressure of 8-12MPa.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through a combination of streamlined overall configuration, differentiated hollow structure, and staggered height protrusions, provides stronger buffering capacity in key areas such as the forehead and back of the head, while also ensuring lightweighting in non-critical areas, thus improving collision energy absorption efficiency; the elastic resilience of the silicone material, combined with the hollow structure, enables stable buffering performance after multiple collisions.

[0017] 2. This invention uses the gaps between the circular raised silicone dots and the through holes to form a continuous ventilation channel, which increases the air circulation rate and reduces the head temperature when wearing it, effectively solving the problem of stuffiness and sweating. The comfort of wearing it for a long time is significantly improved. The arc-shaped streamlined design adapts to the head contour, and the gradually changing thickness at the edges reduces the feeling of pressure. The raised silicone dots of staggered height fit the curved surface of the head, and the height difference between adjacent raised dots is controlled to ensure balanced force. The rounded corner at the top avoids friction damage. The overall wearing experience has no obvious pressure points and strong stability.

[0018] 3. This invention utilizes a combination of modular adjustable inserts and negative pressure adsorption molding. The adjustable inserts have pre-defined three-dimensional spatial positions and height differences of the protrusions on the mold; negative pressure adsorption allows liquid silicone to uniformly coat the top of the inserts, integrally molding a hollow shell structure with uniform wall thickness. This effectively controls the distribution of protrusion height. By applying a higher-intensity first vulcanization combination to the large, wide areas of the rubber compound, and a relatively mild second vulcanization combination to the narrow, small areas, this process actively compensates for differences in heat conduction and vulcanization reaction rates caused by different geometric shapes. This ensures the uniformity of vulcanization along the overall length of the product, avoiding under-vulcanization in wide areas due to insufficient heat accumulation or over-vulcanization in narrow areas due to overheating, thus guaranteeing the consistency of the product's mechanical properties and structural reliability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This invention relates to a three-dimensional structure of a lightweight impact-resistant cap cushioning pad. Figure 1 ; Figure 2 This invention relates to a three-dimensional structure of a lightweight impact-resistant cap cushioning pad. Figure 2 ; Figure 3 This is an interface diagram of one row of circular raised silicone dots in the cushioning pad of the lightweight anti-collision cap of the present invention.

[0021] In the picture: 1. Buffer pad body; 2. Circular raised silicone dots; 3. Narrow end; 4. Through hole; 5. Wide end; 6. Hollow cavity. Detailed Implementation

[0022] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1

[0024] See Figures 1-2 This invention provides a lightweight impact-resistant helmet cushioning pad. The cushioning pad is integrally molded from addition-type liquid silicone with a Shore hardness of approximately 45°. The cushioning pad body 1 is an arc-shaped strip conforming to the human head, with a streamlined shape consisting of wide ends 5 and a narrow middle end 6. Multiple circular raised silicone dots 2 are provided on its inner surface. Each circular raised silicone dot 2 is frustum-shaped with a rounded chamfer at the top. Its height is carefully designed to be staggered between 3mm and 8mm, with a bottom diameter of approximately 5mm. The center-to-center distance between adjacent circular raised silicone dots 2 is approximately 8mm. Because the heights of the circular raised silicone dots 2 are staggered and evenly distributed, when the lightweight impact-resistant helmet is impacted, the circular raised silicone dots 2 can elastically shift and deform under pressure to reduce and disperse the impact force transmitted to the head. Each circular raised silicone dot 2 has a hollow cavity 4 with an open bottom and a wall thickness of approximately 1.0mm inside. The circular protruding silicone dots 2 located at the wide end 5 correspond to the forehead and back of the head. The average volume of the cavity 4 is larger than that of the circular protruding silicone dots 2 located on both sides of the top of the head at the narrow end 6, thus achieving a differentiated distribution of cushioning performance.

[0025] Specifically, multiple circular through holes 3, penetrating the thickness of the buffer pad body 1, are provided at the intervals of the circular raised silicone dots 2. The gaps between the circular raised silicone dots 2 naturally form grooves. The through holes 3 and the grooves are interconnected vertically and horizontally, together forming a three-dimensional ventilation channel system.

[0026] Preferably, the array of raised silicone dots 2 is distributed according to the acupoints on the human body. The density of the array is slightly increased or the height of the dots is slightly adjusted near the Yintang and Yangbai acupoints to ensure that these areas can be gently stimulated when worn. In the approximate area corresponding to the Baihui and Sishencong acupoints, a cluster of dots with a slightly higher height or slightly larger diameter is set to provide a more obvious pressing sensation. In the area along the line corresponding to the Fengchi, Tianzhu, and Naohu acupoints, the arrangement of the dots roughly coincides with the direction of the acupoint connection, forming a low-intensity massage band. When the user is wearing the helmet for work, the slight movement of the head or the moderate pressure of the cushioning pad itself can be naturally converted into intermittent, gentle pressing on the relevant acupoints, which plays an auxiliary role in soothing and relaxing and refreshing the mind, without changing the main way of wearing the helmet or adding any complex mechanisms.

[0027] More specifically, the internal design of the circular raised silicone dot 2 is a hollow cavity 4, which can efficiently absorb energy through the dual mechanisms of shell wall bending and cavity collapse, and significantly reduce the peak impact force.

[0028] Optionally, the plurality of circular raised silicone dots 2 are arranged in an array, with the center distance between adjacent raised silicone dots being 1.5 to 3 times their diameter. This ensures sufficient gaps between the circular raised silicone dots 2, allowing each dot to generate sufficient lateral deformation and fill adjacent spaces under pressure, thereby maximizing the material's deformation energy. If the spacing is too small, the dots will rigidly interfere with each other, affecting independent deformation; if the spacing is too large, the buffer unit density will be insufficient, and the overall stiffness will decrease. Meanwhile, the gaps between the circular raised silicone dots 2 (determined by the center distance and diameter) are a key component of the passive ventilation channel. The ratio of the center distance to the diameter directly determines the minimum width of the gap. This ratio range ensures the effectiveness and stability of the ventilation channel, avoiding problems such as airflow blockage due to excessively dense dot density, or airflow disorder and uneven heat dissipation despite a wide airflow due to excessively sparse dot density.

[0029] Furthermore, the outer edge of the cushioning pad body 1 adopts a thickness gradient edge design, smoothly transitioning from about 7mm in the central area to about 2mm on the outermost side, in order to better fit the cap shell.

[0030] Furthermore, at least a portion of the through-hole 3 located at the wide end 5 and the narrow end 6 is configured as an elastic connecting sleeve. An annular inner flange is formed on the wall of the elastic connecting sleeve, creating an elastic locking structure for snap-fit ​​connection with the corresponding connecting post inside the lightweight bumper cap shell. This achieves a tool-free, reliably removable connection to the cap shell, eliminating the need for external connectors and avoiding adhesive aging issues.

[0031] Example 2

[0032] The process flow for preparing the lightweight impact-resistant cap cushioning pad described in Example 1 in this embodiment specifically includes: S1. Based on the streamlined structure of the buffer pad body 1 and the distribution of the circular raised silicone dots 2, the mold is designed and processed. The mold is made of 718H pre-hardened steel and adopts a modular insert and adjustable ejector pin combination structure. The raised forming area is composed of independent modular inserts. The bottom of the insert is connected to an adjustable ejector pin with a connection accuracy of ±0.1mm, which is used to adapt to hollow cavities 6 of different volumes. The raised forming surface of the modular insert is sprayed with a 5-8μm thick polytetrafluoroethylene (PTFE) nano-coating to reduce demolding resistance. V-shaped guide grooves (depth 1-1.5mm, width 2-3mm, distributed along the arc contour of the buffer pad) and micro vent holes (diameter 0.5mm, located at the end of the guide groove) are added to the raised gap of the mold cavity to assist in silicone filling and venting. S2. Add nano-grade silane coupling agent (KH-550) at 0.5%-1% of the mass of liquid silica gel and fumed silica at 1%-2%. Disperse the silica gel in two stages using a twin-screw mixer (300-500 r / min, mixing for 5-8 min) and an 8-10 stage static mixer (material residence time 2-3 min) to control the silica gel viscosity at 3000-3500 cP. Place the modified silica gel in a degassing tank with a vacuum degree of -0.095 to -0.1 MPa and let it stand for 15-20 min to remove micro-bubbles. S3. Inject silicone into the mold cavity and use zoned temperature-pressure vulcanization: Preheating period (0-2 min): Temperature 120-130℃, Pressure 5-8 MPa; Vulcanization period (2-8 min): Wide end 5 corresponds to a cavity temperature of 160-180℃ and a pressure of 15-20 MPa; Narrow end 3 corresponds to a cavity temperature of 140-150℃ and a pressure of 8-12 MPa. Pressure holding period (8-15 min): Temperature 130-140℃, Pressure 10-12 MPa; S4. A combined process of gradient cooling and vacuum demolding is adopted. First, the mold is heated by an outer heating sleeve to maintain the temperature at 100-120℃ (1-2 min), then cooled by circulating water at 50-60℃ (2-3 min), and finally, room temperature air at 25-30℃ is introduced (1-2 min). The temperature change rate is controlled at 20-30℃ / min. Finally, the vacuum degree is evacuated to -0.08 to -0.09MPa through a micro exhaust hole. After holding the pressure for 10-15s, the ejector pin is activated to push slightly to complete the demolding.

[0033] S5. Automatically generate cutting paths based on the 3D model of the buffer pad to remove edge burrs.

[0034] Experiment 1: Impact Performance Test of Buffer Pad Following the test method in Section 6.5 "Impact Protection" of BSEN 812:2012 "Industrial Helmets", impact energy absorption performance of buffer pad samples with different hardness types (40°, 45°, 50°, 55°, and 60°) was tested. Different collision scenarios were simulated using headgear tilt angles of 30° and 60°, and the maximum impact force transmitted to the headgear was recorded. Test data were obtained from four independent repeated tests (Test 1–Test 4), and the average transmitted force at each angle was calculated.

[0035]

[0036] Table 1

[0037] The following is a summary table of experimental data based on 60° silicone hardness, broken down into four dimensions: height, arrangement, diameter, and density. It includes core indicators such as the average force transmission value for different options in each dimension.

[0038]

[0039] Table 2

[0040] Analysis of the above data reveals that the sample from this scheme performed best across all hardness types, especially in the 30° angle test where all values ​​were below 10000N. In the 60° angle test, except for the 40°, 50°, and 55° hardness values ​​which were slightly close to or slightly above the threshold, the overall performance was excellent. Sample number 7 at 60° hardness fully met the standards in both angle tests, demonstrating its stable protective capability under high hardness conditions. Table 2 shows the influence of the buffer pad structure design. Comparing parameter groups (e.g., comparing groups with the same 60° hardness but 8mm intervals: parameter groups 7 / 8 with uniform height and parameter groups 13 / 14 with varying heights), the sample with the "variable height" arrangement (B2) had a significantly lower average impact force at 30° angle (approximately 8800-9000N) than the sample with the "uniform height" arrangement (B1) (approximately 9400-11300N). This directly and quantitatively demonstrates the unexpected technical effect brought about by the "uneven height" feature in claim 1—it can more effectively disrupt the stress propagation path, achieve multi-level buffering, and thus significantly reduce the peak impact force. The result verifies that the buffer pad of this solution has good impact energy absorption performance and structural durability in various usage scenarios, and is suitable for promotion and application as the core buffer component of industrial anti-collision caps.

[0041] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A lightweight impact-resistant helmet-shaped cushioning pad, comprising a cushioning pad body, characterized in that, The cushioning pad body is integrally molded from silicone material. The cushioning pad body is an arc-shaped strip adapted to the human head, and its overall structure is a streamlined shape that is wide at both ends and narrow in the middle. The surface of the cushioning pad body that contacts the head is provided with multiple circular raised silicone dots. The height of the multiple circular raised silicone dots is staggered and the spacing is evenly distributed. Through holes are provided at the intervals of the multiple circular raised silicone dots, and the gaps formed between the circular raised silicone dots constitute ventilation channels.

2. The lightweight impact-resistant helmet-shaped cushioning pad according to claim 1, characterized in that, The height of the plurality of circular raised silicone dots ranges from 2mm to 12mm, and the diameter ranges from 3mm to 8mm. The center distance between adjacent circular raised silicone dots is 1.5 to 3 times their diameter. The outer edge of the buffer pad body and the non-contact head side adopt a thickness gradient design, with the edge thickness gradually changing from 5-12mm from the center of the body to 2-3mm from the outside.

3. A lightweight impact-resistant helmet-shaped cushioning pad according to claim 1 or 2, characterized in that, The cross-sectional shape of the circular raised silicone dot is one of cylindrical, frustum-shaped, or hemispherical, and the top of the circular raised silicone dot is provided with a rounded chamfer with a radius of 0.5-1mm.

4. The lightweight impact-resistant cap cushioning pad according to claim 2, characterized in that, The interior of the plurality of circular raised silicone dots is configured as a hollow structure, wherein the average volume of the hollow cavity inside the circular raised silicone dots located in the forehead and back of the head is greater than the average volume of the hollow cavity inside the raised dots located in the middle region.

5. A lightweight impact-resistant helmet-shaped cushioning pad according to claim 1, characterized in that, The height difference of the multiple circular raised silicone dots is controlled within the range of 1-3mm, and the height difference of adjacent raised silicone dots in the same area does not exceed 2mm.

6. A lightweight impact-resistant cap cushioning pad according to claim 4, characterized in that, The hollow cavity is a shell with an opening at the lower end, and the lower end opening is that the hollow cavity is open at the root position where it connects to the buffer pad body.

7. A process for preparing the lightweight impact-resistant cap cushioning pad as described in claim 1, characterized in that, Includes the following steps: Step 1: Design and process the mold based on the streamlined structure of the buffer pad body and the distribution of the circular raised silicone dots on the inner surface; the mold adopts a modular insert and adjustable ejector pin combination structure. The raised forming area of ​​the mold cavity is composed of independent modular inserts. The bottom of the insert is connected to an adjustable ejector pin with a connection accuracy of ±0.1mm. The raised forming surface of the modular insert is coated with a 5-8μm thick polytetrafluoroethylene nano-coating. At the same time, V-shaped guide grooves and micro exhaust holes are added at the raised gaps of the mold cavity. The V-shaped guide grooves are 1-1.5mm deep and 2-3mm wide, distributed along the arc contour of the buffer pad. The micro exhaust holes are 0.5mm in diameter and located at the end of the V-shaped guide grooves. Step 2: First, pre-dispersion modification of the liquid silicone is performed by adding nano-sized silane coupling agent at 0.5%-1% of the liquid silicone mass and fumed silica at 1%-2%. Two-stage dispersion is carried out using a twin-screw mixer and an 8-10 stage static mixer to control the viscosity of the modified liquid silicone at 3000-3500 cP. Then, the modified liquid silicone is injected into the cavity of the mold, and vulcanization is performed using a gradient temperature-pressure synergistic method. Specifically: Preheating time: 0-2 min; temperature: 120-130℃; pressure: 5-8 MPa. Vulcanization time 2-8min: mold cavity temperature 160-180℃ and pressure 15-20MPa for the wide area at both ends of the buffer pad, and mold cavity temperature 140-150℃ and pressure 8-12MPa for the narrow area in the middle of the buffer pad; Pressure holding time: 8-15 min; temperature: 130-140℃; pressure: 10-12 MPa. Step 3: A combined process of gradient cooling and vacuum demolding is adopted. During the gradient cooling process, the temperature change rate is controlled at 20-30℃ / min. First, the temperature is maintained at 100-120℃ by the heating jacket of the mold cover for 1-2 minutes, then cooled by circulating water at 50-60℃ for 2-3 minutes, and finally, room temperature air at 25-30℃ is introduced for 1-2 minutes. Before demolding, the vacuum degree is evacuated to -0.08 to -0.09MPa through the micro vent holes of the mold cavity, and demolding is completed by slight pushing with the ejector pin. Step 4, Trimming Inspection: Laser trimming is performed using a laser cutting machine. The cutting path is automatically generated based on the 3D model of the cushioning pad. After trimming, the edges are inspected using a combination of a 3D vision camera and a pressure sensor.

8. The preparation process according to claim 7, characterized in that, Before the injection of the adhesive in step two, the modified liquid silicone needs to be vacuum degassed: place the silicone in a degassing tank with a vacuum degree of -0.095 to -0.1MPa and let it stand for 15-20 minutes to remove the tiny air bubbles generated during the mixing process inside the silicone.

9. The preparation process according to claim 7, characterized in that, For the mold cavity portions of the wide areas at both ends of the buffer pad body, a first temperature-pressure combination is used for vulcanization; for the mold cavity portions of the narrow middle area of ​​the buffer pad body, a second temperature-pressure combination is used for vulcanization; the temperature and pressure values ​​of the first temperature-pressure combination are higher than those of the second temperature-pressure combination. The first temperature-pressure combination has a temperature of 165-180℃ and a pressure of 15-20MPa; the second temperature-pressure combination has a temperature of 145-160℃ and a pressure of 8-12MPa.

10. An industrial crash helmet comprising a lightweight crash helmet cushioning pad as described in any one of claims 1-4, characterized in that, The buffer pad body is assembled on the inner side of the anti-collision cap shell. At least one fan is provided at the brim of the anti-collision cap. The airflow direction of the fan is towards the inside of the cap body, and the airflow delivered by the fan can flow along the grooves and gaps formed between the circular raised silicone dots on the buffer pad body.

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